Educational information, not individual financial advice.
Key Takeaways
Health insurance is the largest single insurance purchase for most Americans — directly or via employer — and the most complicated. Understanding the basic structure helps evaluate plans and predict out-of-pocket costs.
Every plan has four numbers that determine your actual costs:
Premium. Monthly payment to have coverage, regardless of whether you use it.
Deductible. Amount you pay in-network before the plan starts paying (for most services). In 2026, HDHPs require minimum deductibles of $1,700 (self) or $3,400 (family); non-HDHP plans can have lower.
Coinsurance. Percentage you pay after deductible. 20% is typical — you pay 20% of each service, insurer pays 80%, until you hit the out-of-pocket maximum.
Out-of-pocket maximum. Annual cap on your costs (deductible + coinsurance + copays for in-network care). Once hit, the plan covers 100% for the rest of the year.
Out-of-network care often has much higher costs and doesn't count toward the in-network out-of-pocket max.
HMO (Health Maintenance Organization). Requires primary care physician referrals to see specialists. In-network only (except emergencies). Lower premiums; more restrictions.
PPO (Preferred Provider Organization). No referrals needed. Out-of-network available at higher cost. More flexibility; higher premiums.
EPO (Exclusive Provider Organization). No referrals needed; in-network only. A middle ground.
POS (Point of Service). Hybrid — requires primary care referrals for lower costs, but allows out-of-network at higher cost. Less common.
HDHP (High Deductible Health Plan). Qualifying plan that pairs with an HSA. Higher deductible, lower premium, HSA eligibility. Any plan type can be an HDHP if the deductibles meet the IRS threshold.
Employer-sponsored insurance. Covers ~160M Americans. Employer typically pays 70–85% of premium. Best deal most people can get because of tax-favored premiums and employer subsidy. Plan options vary by employer.
Individual marketplace (ACA exchanges). For people without employer coverage. Subsidies based on income. Plans categorized as Bronze (60% actuarial value), Silver, Gold, Platinum. Used by self-employed, unemployed, early retirees, gig workers.
Medicare. Federal program for 65+ and some disabled. See the Retirement section.
Medicaid. Joint federal-state program for low-income Americans. Eligibility and coverage vary by state (many states expanded coverage under ACA, others didn't).
VA, TRICARE, and others. Specific programs for veterans, military, federal employees, Indian Health Service.
The right plan depends on expected healthcare use:
Low expected use. HDHP with HSA makes sense. Pay lower premium, maximize HSA tax benefits, bear some cost for occasional needs.
High expected use / chronic condition. Lower-deductible plan may come out ahead, even with higher premiums. A condition requiring $3,000/month in medication would hit the deductible on HDHP very quickly — and then pay 20% of every prescription — while a Gold plan might have a small copay and cover most cost.
Family planning pregnancy. Maternity costs often run $10k–$30k out-of-pocket under HDHP before hitting the cap. Lower-deductible plans may be cheaper overall for the year of the birth.
Stable, predictable situation. Do the math. Total annual premium + expected deductible/coinsurance = total expected cost. Compare across plans.
Employer plans: typically a 2–3 week window in fall (open enrollment period). Miss it and you're locked into your current plan for the year except for qualifying life events (marriage, birth, job change).
ACA marketplace: open enrollment runs November 1 – January 15. Special enrollment periods for qualifying life events.
Medicare: initial enrollment period 7 months around age 65; annual enrollment period October 15 – December 7.
Missing enrollment windows creates either no coverage or lifetime penalties (Medicare Parts B and D). Calendar these dates.
"Network" is the set of providers that have contracts with your insurer. In-network providers:
Out-of-network providers:
Verify a provider is in-network BEFORE receiving care. Websites are often out of date. Call both the provider and insurer to confirm.
The No Surprises Act (effective 2022) limited surprise out-of-network billing for emergency care and for in-network hospital services, but gaps remain.
When you leave a job:
COBRA: Continue same coverage up to 18 months. You pay full premium (employer's portion + yours + 2% admin). Very expensive.
Spousal plan: Enroll in spouse's employer plan if available (special enrollment period).
ACA marketplace: Apply during special enrollment period (60 days after losing coverage).
Gap coverage: Some states have short-term medical plans; most have limited benefits and should be bridges only.
Horizons tracks healthcare expenses including premiums, deductibles, and out-of-pocket costs. Pre-Medicare (retirement before 65) can be modeled with higher expense assumptions reflecting ACA market premiums. Post-Medicare models Part B/D premiums and supplemental costs.
Which pairing is designed to unlock a triple tax advantage for eligible savers?
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HDHP + HSA Strategy
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